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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3723a4c2321c9e5972131cfb4ac22428cef5d03bc278ffdb7e42722438ff45f5' 
  AND token = 'vxRsBowQcv2nfiiufOPVwgxm3084x7hBQHTDTf/yPxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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