SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1f59ebba85859f02a929f7c74939a23c5aa238a6191ee95371e4df8c60f224' 
  AND token = '7ZPQ29KpVFBB0jqzphBkSJ1q2veWuoyhgWoHb9jBsFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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