SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb72b58d39639438239da4e60319bc5bbcaed6191718b2d4aa0c06fa8fe63ce' 
  AND token = 'TSGXqJSXphhvMc/1H46rTmq7+2+ZMdgijOqGi37CMHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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