SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7800493a0bbce574a2b893eadcd9aa48254f1a3b22b6390d1ddedda49251b562' 
  AND token = 'vtHNGHw2fVzq7leqW203ZYPOmFwlX7vth9YKjgGVRjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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