Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f1ab16f793ad86b55f12ee28ac090e875c530eaf58731a8f9d04ae81c48d12' 
  AND token = 'C/Lm3Rm0fG8J2AjzFS9c7e7Bp6kwi1Q+eK2YYOryywM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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