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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b672c3b06845c88ef3bf9a70f6b498a3828805e02e8bbd847b490ffdd3b9f7c8' 
  AND token = '6th+sm94pRVyjZRVuAHMgTTtM0P6QTw3NkCMMq+MXbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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