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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfe3f8e76c2c419a5a6d8fd51259c2d3955b33b501e11e0e0afe9e02b59cc1b' 
  AND token = 'ntjli8sZup7RCfE7PKZu3J47YpzZ6oeWe//erzMl4dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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