SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2832620bb2e526a921f4c3214b2031c9923987d68a02d97dbf28fdd6357848a6' 
  AND token = 'myaL0vLuNX+ZO14rtG6w/xwPgCny/3s+2P/URMwRvKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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