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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f4245fac3ad9c623a66361ff667996c33f329db46539bb883a60471f56a97d' 
  AND token = 'HN8QiaNWLZjoPHB3rv6f2M9KMlB7fMVuf4UUYlKvX4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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