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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7c961f91c319f1f160f55c66f30aa155e778b85722208ad67d0ee2be8cd108' 
  AND token = '8CEcb5ti+xfiv7t+peBDxUlERi0HpYyAwzOa+P5yGV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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