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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4935a154039afc15bf7b1705cbd7170a0c4872adb60ae1f7ceabfb9dee6e1b9' 
  AND token = 'b7CXiQyVbw0xyz5snPI/0iJTjheYjKWOP+RuLHJKLUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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