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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3e48bdb9df4e1088fa48e07033ce9d7c80ddf8ba208f0cba6b05da7593445f' 
  AND token = 'Hg45jkl7SQ3ZYhnHqu//c2p/5d/4ffM/8NqCnsJ1Bc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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