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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92e41e4b87f1f04fe0bd485b384385302f3bb0d59c8cb4c8f0ad364e0be7c28' 
  AND token = 'gJizNEPq0HBoudA71xjTvUvqU7xIO5wvHx+HMu05SIA=' 
  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"
    }
  }
}