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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5af037599e635f50aa35f79521949837c3853658b39cb12a8d5e88180caf39b' 
  AND token = '6fQjim484EwDIUW9Fwz1RKCvLEP415i6Thf8Viqpr7U=' 
  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"
    }
  }
}