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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3948ccf2dc1e6775c56bae90ab8d9c3fc4b217ce7c75ea53cbc7630145334d' 
  AND token = 'p/39eoWK6OLr8OYmgkp8LGWOIPGXAMQyYgzGH25K1H8=' 
  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"
    }
  }
}