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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91b9d7d949849c37c39220980dae148d64cb96582d8cf5e6bb376b657390781' 
  AND token = 'D3vU303hyXy/Mi5EKphv6DoDEjtgymllkeXQTP2lq+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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