Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5506f51f288fb2357c8983396913346bed12bf51c581c9e8b023babd52b0a2' 
  AND token = 'J9h4YiO7XJueN5RWC2KghRS8RYz25lVbQeWhf9LvBNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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