Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5436ad5449e86a2b40b584316d31a4140e64aefa66b5c3f469e4d2a5f43b316b' 
  AND token = 'sSRaRfwDBrhkyt/BIbDRFIH6cBd+1yCRMjDzRQEXUI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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