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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25e49b7604c56d8db780babf9b1ec1b920c214668e3bb2cc6ccb55a2a897b46' 
  AND token = '3C/f2Vi330HoCtVf1DXSYAlt3T2G69olw/eS1Hhl0tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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