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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81dccca32dbd1dbc4afadf709ea91249c7c1b54d28ac100778b9a40bf6fd88f3' 
  AND token = '5hdWyyelNSHuoM+gO45J3Hoee4a2sn2yLw8Xg3pjLvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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