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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff10d8cfb64b1fe127f9ff3d8987b99a12b9e198342d8dd84d84a6040b27e864' 
  AND token = 'Yu8faHeOxoXrADb26A6TwodgFhKq7qhZPnf68dFn2+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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