Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4921d851ca7da38a5320653071592d680885be8022b3a43d959f55862bc44a1c' 
  AND token = 'DFvtbNLQtyEhEN3q6awFh+0NCU/eeAkidEOXjjCeFEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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