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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999aa50a37167c29ca97fce6e507a5660596f9746f9da67237ee4525b1c509ee' 
  AND token = 'aeaGY3eeDckpHR/GfiTfdjLXLKtom00X3CUj6c4tPj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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