SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2454078a906f68da90131fbfd2b2622552d85ebc9a17389d9d67b390ec4058' 
  AND token = 'QolOxFqTScu3iq+wNz2pRuJFbl4uVlF/hbQK4jP1JI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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