Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cfdae9f9c1c7f65566c099ee8cdb7bc755b748bc0659753ccb0a5904c3f8b2' 
  AND token = 'iJ/m7NTjPS6kPckp78Oo+JQZQqO+veJ4AUGDHrE0hmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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