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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ed76f416518b1794607b40e7a97e81c4299b9c029710aea25c6ead590f3aa1' 
  AND token = 'TJ5FX6edCK8Fc+4KlGJZX4yltUth2h2ERV8VN+YHuLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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