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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a415c7db78770e19d211dc806566fde1f72d3a515be0a63f8b8810391aff3136' 
  AND token = 'LYcYdsBYAwy8/JXl8s4AnOGRtDwtoF9w7oqOtTU7E2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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