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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f7d88b5b1b2e674fb9eda95becf03093309d60c73df39870471fdc6be368c2' 
  AND token = 'YxZ2ufd/K/5oh/3LCbQMXbBNnaYWI43ep2/5BbQ1xaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}