SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67a05a9b79749e8f149d8e0a2ce761b25050059abf428feb061b26c06a215c5' 
  AND token = 'QCpqPREDVJDh5i9pWvXndDBG+g2u8ajF7bBvUNw+xfE=' 
  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"
    }
  }
}