Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0cb847d2aa85a4e94df58d1724b807a0b68740e7f418fb7c338274dbd52c651c' 
  AND token = '0j4caSzJ2eobUST/OCdW+8Rq3edqq5Tv7I5m71X6vKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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