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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06c86c3fe4e9ad02349968e1078ee083baee37d5c2b65174d92c93575c826d6' 
  AND token = 'v1FZR//YLMqJZZFlBUXDnttjXTDx98kwo/y6BsmQ/2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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