Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c7ad8ede0fecff7bfee4e985ecef83b998b828968dbdc4326bec492e6fa938' 
  AND token = 'NVpCmLDXkPq+IdSJqQbsIKGe0IbmD3DEbsfi/EhHoI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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