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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f3582119a43b082315bf4c890fc5fcec1cac60c1adf497a8c3d065b644a435' 
  AND token = 'ZebaE7R4NqGwgHroAgTm0fH62Sv3lBmrTN7CSIZ08mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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