Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8fbaa29b8818728d234d1b7df892b26e0409f4413de8918c748caebc2768a3' 
  AND token = 'Ha8955XdzLVmHDdGDmvamjiskr7dnaK5Uh0751jjfWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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