Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a27dc03be64cc3ccc7b9f6c697316fbb8cffbb2afd3b12518db94a100c1f2c' 
  AND token = '3F+kuevXT+6lIYm0I5n6SB3LeXtXpiCEXPhhd85d/uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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