Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d427fe116c1d6762f841ad4d1754e27d01edbcb842c17e762f27a8b8da9ea5' 
  AND token = '0ij/2fQKCnwbeQxpbuZwjJWOdm1A1CDl1TTvaHdOCVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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