Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f06a113ba6a61f691c0afead4de2fd597fa887bf09b5c9b8163a85ee19e8218' 
  AND token = 'y9I5S7MId+wZ2AtI2QY68BZRlJmdQAWY968mam3kHgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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