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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83b629c5a94e33af1b355e4358a253371b3a166bbdddf636f74b542378e2e96' 
  AND token = '5oo5gxVGDc2pe3bYVda2RqSbVu3XipBCi2sWuLSXk38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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