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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b260518e4b97b99fd16f158b1f9d61eab90a7bef0dca6f9d2dbbc4161fcc73ce' 
  AND token = 'nTyOUnDYBgD8YoTavcOfubQxqPbs56ojyXYuYSR/lrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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