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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3859271f4c08cfa650457b13a27611e553a3cac776d20c7c49258e3918037b50' 
  AND token = 'lxboYNOdNCW6GghLx5LTHl8c1Z1cANmZ14kO1+6SZns=' 
  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"
    }
  }
}