Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0db0a6a5a02abb75306aa18be97d6729e81be76be10b4dd5c0e7aec26ac98f' 
  AND token = 'RhlKLnacRso1SdbqcnrNGrhcuct9klFTc9GITUIT4yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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