Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138b625e402f6efbd7dbf233c54704239cd18082f6832ac1ba07f145ea7229b0' 
  AND token = 'AcU7htvxcqU5UQgw7D4TzG/ken3UFU7THWG2gsrp+xk=' 
  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"
    }
  }
}