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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ac838eb0c48a5cef958fc3cf3d220e41de457471f6476cde106e79f602e583' 
  AND token = '6LbmkwFiht8buoTPcPs98QdPWSp4xf6UuTd1+nL+rxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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