Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d864fd276bb78cb3cef77d3e8100bdc29e82bbe02293482c431ad0f2b7a7d1' 
  AND token = 'Zb70FbzCDmJsS231FTf3MGOJb41e/y+kpeveZIGOU/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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