Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6fa213f29ed98c087f8796a2630648570ed610acc4a4bc6e82657c556e7d7c' 
  AND token = '7KpF7W0g11y9nWsyHQg7LBSFlZ/SfxqecLNRPw09CUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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