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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d6f673ef8d5c558c500d1b74416a0a6be94cdf1f4985b8f6fecefedce8b507' 
  AND token = '8natoxKpHWS9EdcAlT/0v5vteK2AwG1gFRk/VPSWg7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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