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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083f5809756130bba0a79ee48f880909ab7d341ed6f5f7ee9b556eb00a47cf7e' 
  AND token = 'lhGGkok5vQmxbTAWG1ng0DkbWJrErn4SxV8MatBfde0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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