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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce98128c54c444aef89a5b27cb7eddb2fd125d366e398990828c9c032b39aa24' 
  AND token = 'XrfQ6jsdolSz3TnYFT0NrhPxXC6yWB4zCXH6RdAeE3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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