SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784cb58341f19f1338b9b7c287362f1955d5ca6294ef5a72b541a83fd9d368ef' 
  AND token = 'w8cIhzHVqXRdAssVsGOvzhTzErzqbIJbqeGTWH60HHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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