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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812559d3a17598c223c0bbe25664cab0192d48fefa7284b7decd19e133f49e10' 
  AND token = 'OOxGBZCJmaL8L7jwtio+G1byP9MZ6kK0uMQTbhFNkS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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