SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4516ae7af3d2d3de8d82a72583627fc6e814d1818b92b6114de910bad52492' 
  AND token = 'reLFJ72ojIjfCqg96uzfQdGRGPKhv02cjULmYcFMRg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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