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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da3e48f5a622ed4d547d979727fa009112b00e95c438a03ca29eb34ecc30983' 
  AND token = 'k5Yz86T8pC/ocsAnwOpemEz8DQDmdh6QitxiGtH/X6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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