SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a091e93cd4d40c35ee7ecc780feb919bf036c834c7a66bcb5f02a5a5d8c5dc' 
  AND token = 'bErnh/7ZBZ6HiZRUz6hByWwsgxk5pqzs9P0L/HjVDzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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