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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079a8b77a161f78922f777bd633e23d02ba676efd874e0c110fbcf996d0ed7f2' 
  AND token = 'N1gDhyy/VJJYJBrPf9YfDPx0L+LIx2E750kYlI5DxH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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