SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2816e034dba7b4bf3ab44e125cff869ce42df98b9d17f29ee75a4698695710dc' 
  AND token = 'HCvdBFApUAdkK6c/iqiwn/mrFv8YODPiaZCZOEKVKiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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