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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ede4a9628d8830e572ef02d5e0bb17ae24b53dd04474cfe55680c03b5f6691' 
  AND token = 'kq5e3sbvWVWSNnTg4aVgiHcGqeT87duSC5CFsX/RwgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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