SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e2ab5e89bb3670e2429f472b9a2456ea0cf4afbc0996e96f8d50d3515c72f1' 
  AND token = 'W7WZs1KWrsgUNiw4NCClfDMkhOuGn1iDpaXSqj++KUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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