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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa186cfe219049232c7f36ea6aaf640ca60bcb928d965e6ed8daa7fd5ecf174f' 
  AND token = '+sBZR3dxiYv3XhBbAaPgj4KJnnk/zB0klNj16o90eBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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