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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cd2038c34a6d0eee33d66bb96ec133ed3f26beac731dd7da19247c1972d487' 
  AND token = 'vZHytaHUp46RvO6OhQXR4z8JY5Ign7jjaxjKZI+gd9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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