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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e9c4646b9c18905f07c4e6d639811b3d050166e5141d17ef270900b23be4f6' 
  AND token = 'RWPgzzWUucHn5OLGIrRvK563X+Z9GfAkYd36/xkWFe8=' 
  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"
    }
  }
}