Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973afb748616fc7490de9eed610facf871b4411d54af7ff3904c5cc070017fc6' 
  AND token = '0VT61+qGQvx0dNY/DgoWCP61hV632AmTU4FT44xUQ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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