SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e745a7d426510960842623177244d3e7dcb2f266192624497f7715bca9db47' 
  AND token = 'jAZAH3/2wuqK5bcXBMkv/LJT+BjYU7jSnZ3X3lkwRjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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