Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42aef0f31af21bcf9b9da815e991bcfed8e015bdafa49ff59df33baead30ffd1' 
  AND token = 'HQoiNC3UqQCSar0kr1Gp7HBNbDBNVHstbG65OLVKnfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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