SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64021f1bd1c27f1b65d12abc20e9d4d9ddff4e58571993fa0ca31636930f8ad9' 
  AND token = '6Ap92FCKYU7+O/k8XvFj6VQWGEKhsTqG+O2Enq0adps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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