SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605df149bb1eea52d81bf872a99d779d58ced0bff197d90883ba3b55481fcf56' 
  AND token = '9hA6+3VcQ3AS4RAfOXuG9YF4VpKPnwqCU0MXFHspBJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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