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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7859f8e0d06d9c638140c25a6adfea26799d9b8e3ed50f378d0fd3895e5b674' 
  AND token = 'g7l/id1dagKXcGqSmi1RMOfjwbhfhb7VteFJfeXNG7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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